Spok Holdings Inc (SPOK)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	1,542,396	$25,356,991	0%
2.	Vanguard Group Inc	1,020,311	$16,773,913	0%
3.	Dimensional Fund Advisors Lp	699,563	$11,500,607	0%
4.	Hightower Advisors, Llc	522,651	$8,592,389	0.01%
5.	Goldman Sachs Group Inc	521,571	$8,574,624	0%